Improve RedisRepository chunk method

Ensures chunk count is at least 1, uses static closure for key mapping, compares cursor as string, and sets default prefix to empty string for better reliability and consistency

Author: stevebauman

src/Repositories/RedisRepository.php

@@ -31,6 +31,8 @@ public function exists(string $hash): bool
      */
     public function chunk(string $pattern, int $count): Generator
     {
+        $count = max(1, $count);
+
         [$cursor, $prefix] = array_values($this->getScanParameters());
 
         do {
@@ -53,10 +55,10 @@ public function chunk(string $pattern, int $count): Generator
                 continue;
             }
 
-            yield array_map(function (string $key) use ($prefix) {
+            yield array_map(static function (string $key) use ($prefix) {
                 return Str::after($key, $prefix);
             }, $keys);
-        } while ($cursor !== '0');
+        } while ((string) $cursor !== '0');
     }
 
     /**
@@ -75,7 +77,7 @@ protected function getScanParameters(): array
             ],
             default => [
                 'cursor' => null,
-                'prefix' => null,
+                'prefix' => '',
             ]
         };
     }